Bush hammer



July 5,1927 V ,6 98

J...J. FADBURY BUSH HAMMER Filed Oct. 15, 1926 lvvmznioz doH/vd Pa al/ rPatented July 5, 1927.

UNITED STATES JOHN J. PALDBURY, OF BARRE, VERMONT.

BUSH HAMMER.

Application filed October 15, 1926. Serial No. 141,801.

This invention relates to .stone cutters bush hammers.

An important objectof the invention is to provide a bush hammer havingthe usual cutting blades and means for positively securing the blades inposition whereby they are prevented from loosening during the operationof the hammer.

A further object is to provide a hammer v19 of the type referred toprovided with a locking key of a novel type for secure y locking theblades against movement.

A further object is to provide a hammer of the type referred toprovided-with a thrust plate or looking member arranged above the bladesand having portions contacting therewith to prevent lateral movementthereof, and a locking key which .is adapted to be driven into positionto clamp the blades in posit-ion and also to tightly clamp the thrustplate and hold the ends of the blades in contact with the thrust plate.

A. further object .is to provide a hammer of the type described whereinthe parts are readily removable and replaceable.

Other objects and advantages of the invention will become apparentduring the course of the following description.

In the drawings I have shown one embodiment of the invention. In thisshowing:

Figure 1 is a side elevation,

Figure 2 is a section on line 22 of F ig- 35 ure 1, parts being shown inelevation;

Figure 8 is a transverse sectional view on line 3-8 of Figure 1, and,

Figure 4 is a detail perspective of the key and thrust plate detached.

Referring to the drawings, the numeral designates the body of the hammeras a whole including an enlarged head 11 and a shank of the usual type121 The head 11 is provided with handle attaching sockets 13. The headis further provided in its lower end with a recess indicated as a wholeby the numeral 14 in which elements to be described are adapted to bereceived. The recess 14 is provided with an upper wall 15 arrangedsubstantially at right angles to the axis of the shank, and this wall isprovided centrally thereof with a socket 16. One side wall 17 of therecess 14 is arranged sub stantially parallel to the axis of the shank12 while the opposite wall 18 is slightly inclined .and is provided witha groove 19 for a purpose to be described.

A thrust plate 20 is arranged in the upper end of the recess 14 andincludes a relatively flat body 21, the upper face of which is adaptedto lie against the wall 15 as shown in Figure 2. A lug 22, preferablycircular to assistin preventing lateral movement of the'thrust plate aswill be apparent. The ends of the thrust plate are provided withupwardly extending flanges 23 extending throughout the width of thethrust plate and adapted to snugly contact with opposite sides of thehead 11 as clearly shown in Figure 2. The ends of the thrust plate arefurther provided with depending flanges 24 which extend from one side ofthe thrust plate to a point spaced from the opposite side, as indicatedat 25. A plurality of blades 26 of the usual type are arranged withtheir upper ends in the recess 14, the

'upper extremities of the blades being arranged against the lower faceof the thrust plate 20 and snugly fitting between the flanges 24. Theouter face of one of the outermost blades snugly fits against the wall17 of the recess 14 as shown in Figure 1.

The numeral 27 designates a locking key provided on one side with alongitudinally extending flange 28 adapted to be received in the groove19. As shown in Figures 1 and 4, the key 27 is tapered to decrease inthickness toward its lowerend, while it is also tapered longitudinallyto decrease in thickness toward one end as shown in Figure 3. The groove1.9 is adapted to serve as a guide for the locking key, and the flange28 fits fairly loosely in the groove 19 to permit slight verticalmovementof the key for a purpose to be described. As shown in Figure 1,the upper end of the key 27 contacts with the lower face of the bodypor. tion of the thrust plate 20, the flange 24 being cut away as at forthis purpose.

The operation of the device is as follows: The thrust plate 20 is firstarranged in position and is held in position with the upper face of thebody portion thereof snugly contacting with the wall 15 of the recess14. The blades 26 are then arranged in posi tion with their upperextremities contacting with the lower face of the body of the thrustplate whereupon the key 27 is driven into position. As previouslystated, the key is incross section, is mounted in the socket 16 taperedboth vertically and longitudinally, and the ,longiti linal taper servesto clamp the blades snugly against each other, and against the wall 17and the inner face of the key 27. The vertical taper ot' the key servesto cause the latter together with the blades 26 to move upwardly whereby,both the key and the blades will be driv'ei'i into snug contact withthe lower face of -the thr st plate while the latter also will be drivenupwardly in-to'snug cont-act with the wall 15 oif'the recess. Thus itwill be apparllll tl1llli all off the removable elements of the deviceare .moved upwardly when the key is driven into position, while the keyand the blades are claniped transversely of the head 11. The variouscontacting faces of the device are preferably machined to substantiallyperfect whereby very slight movement of the parts is necessary to effectthe clamping act-ion. In practice it has been found that the hammer maybe operated through long intervals of time without caus ing any of theparts :to become loosened, while the simplicity and ruggedness of theparts permits long operation of the device without breakage. r

It is to be understood that the iorm ot the invention herewith shown anddescrihet is to be taken as a preferred example of the same and thatvarious changes in the shape, sizeia-nd arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the subjoined claims.

I claim:

1. A. bush hammer comprising a head. having a blade receiving recess inits lower end, a plurality of blades arranged with their upper ends insaid recess, a thrust plate mounted in the upper end of said recess,said plate having end portions engaging opposite faces of said head andopposite e(; ges of said blades, and a key adapted to be driven betweenone wall of said recess and the outer face of the adjacent blade, theupper edge oi said hey being adapted to contact with said thrust plate,the wall of said recess adjacent said key being provided with a guidegroove. and a flange carried by said key and adapted to be arranged insaid groove.v I H i 2. A bush hammer comprising a head hav ing a bladereceiving recess in its lower end, a plurality of blades arranged withtheir upper ends in said recess, a thrust plate mounted in the upper endo'l said recess, said plate having end portions engaging opposite tad ofsaid head and op'positeedgtes of said blades, and adapted to be drivenbetween eiie wall of said recess and the outer wall of said recess beinginclined whereby 7 face of the adjacent blade, said key being tapered.longitudinally to decrease in thickness toward one end and being furtherta pered to decrease in thickness toward its lower edge, the upper edgeof said key being adapted to contact with said thrust plate.

,3, A, bush hammer comprising a head having a blade receiving recess inits lower end, a plurality of blades arranged with their 7 upper ends insaid recess, one side wall of said recess being arranged parallel to andadapted to contact with the outer face of one of the outermost blades,the other side said recess decreases in w-idtl toward its lower end,said last named side wall being provided with a groove extendingthereacross, a thrust plate mounted in the upper end of said recess,said. plate having end portions engaging'opposite faces oi said head andopposite edges of said blade, and a key adapted to be driven between theinclined side wall of said recess and the outer face of the adjacentblade, said hey being tapered longitudinally to decrease in thicln nesstowardone end and being tapered vertically to decrease in thicknesstoward its lower edge, said hey being provided on its outer face with aflange adapted to be received in said groove.

4-,. A bush hammer comprising a head having a blade receiving recess inits lower end, a plurality 01 fiat blades arranged with their upper endsin said recess, one side wall 0 said recess beingarranged parall l to aadapted to contact with the outer 1 one Of the outermost blades, theother v wall oi? said recess being inclined whereby said recessdecreases in width toward its lower end, said last named side wall beingfurther inclined whereby said rec as decreases in width toward onelongitudinal end, the upper wall oi --id recess being provided with acentral set, a thrust plate arranged in the upper and of said recess andprovided. on its upper face with :1. lug ar ranged in said socl' saidplate being provided at opposite ends with u ivwardly extending flangesengaging against opposite 'faces of said head and being :lnrtherprovided with downwardly, extending iiaiigjes adapted to engage oppositeedges of said blades, and a key adapted to be driven between theinc-lined side wall of said recess 1 and the outer face of the adjacentblade, said hey being: tapered to decrease in thickness toward one endand being further tapered to; decrease in thickness toward its loweredge. p V 1 in testimony whereof; I aliix my signature.

JOHN J. 'ran'nn'nv.

